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contributor authorElGammal, Tarek
contributor authorAmano, Ryoichi S.
contributor authorAbousabae, Mohamed
date accessioned2025-04-21T10:12:50Z
date available2025-04-21T10:12:50Z
date copyright12/11/2024 12:00:00 AM
date issued2024
identifier issn0098-2202
identifier otherfe_147_03_031103.pdf
identifier urihttp://yetl.yabesh.ir/yetl1/handle/yetl/4305722
description abstractThis research proposes an air-injection treatment for the cavitation phenomena in the Kaplan turbine. An unsteady numerical model is created to predict the cavitating flow through a 3-in. axial hydroturbine before and after the air injection. Pressurized air (jet-in-crossflow) injection is set to be through the turbine housing, and the configuration was altered between 1, 2, 4, and 12 circumferential jets to test the effects of air mass flowrate and injection distribution. Interactions between three fluids (liquid water, water vapor, and air) were considered by utilizing the physics models of volume of fluid (VOF) multiphase, cavitation, and large eddy simulation (LES) turbulence. Surface and time-average results are to be compared with a baseline case of pure cavitation. With the vapor volume fraction created on the rotor components during the cavitation, the absolute pressure scenes clarified the connection between the air treatment and cavitation reduction. While rotation causes negative pressure in the system, the injected air is sucked to such low-pressure zones, and consequently, increasing the absolute pressure above the vapor limit reduces the vapor formation. Preliminary outcomes at 1000 rpm show a 55% reduction in the formed vapor on the blades after air injection by a time corresponding to six cycles of the turbine. A corresponding mechanical power of 12% increase was observed. Moreover, the curve fitting of the data shows that the vapor reduction and power regain are in second order correlation with the increased air volume.
publisherThe American Society of Mechanical Engineers (ASME)
titleStudy of a Cavitation Treatment in Kaplan Hydro-Turbine
typeJournal Paper
journal volume147
journal issue3
journal titleJournal of Fluids Engineering
identifier doi10.1115/1.4067192
journal fristpage31103-1
journal lastpage31103-8
page8
treeJournal of Fluids Engineering:;2024:;volume( 147 ):;issue: 003
contenttypeFulltext


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